Show more different NaCl loading errors.

ppapi/api/private/ppb_nacl_private.idl

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* This file contains NaCl private interfaces. This interface is not versioned
  * and is for internal Chrome use. It may change without notice. */
 
 #inline c
 #include "ppapi/c/private/pp_file_handle.h"
@@ skipping 39 matching lines @@
    * The |enable_exception_handling| flag indicates whether or not the nexe
    * will be able to use hardware exception handling.
    */
   PP_NaClResult LaunchSelLdr([in] PP_Instance instance,
                              [in] str_t alleged_url,
                              [in] PP_Bool uses_irt,
                              [in] PP_Bool uses_ppapi,
                              [in] PP_Bool enable_ppapi_dev,
                              [in] PP_Bool enable_dyncode_syscalls,
                              [in] PP_Bool enable_exception_handling,
-                             [out] mem_t imc_handle);
+                             [out] mem_t imc_handle,
+                             [out] PP_Var error_message);
 
   /* This function starts the IPC proxy so the nexe can communicate with the
    * browser. Returns PP_NACL_OK on success, otherwise a result code indicating
    * the failure. PP_NACL_FAILED is returned if LaunchSelLdr wasn't called with
    * the instance. PP_NACL_ERROR_MODULE is returned if the module can't be
    * initialized. PP_NACL_ERROR_INSTANCE is returned if the instance can't be
    * initialized. PP_NACL_USE_SRPC is returned if the plugin should use SRPC.
    */
   PP_NaClResult StartPpapiProxy(PP_Instance instance);
 
@@ skipping 83 matching lines @@
 
   /* Opens a NaCl executable file in the application's extension directory
    * corresponding to the file URL and returns a file descriptor, or an invalid
    * handle on failure. |metadata| is left unchanged on failure.
    */
   PP_FileHandle OpenNaClExecutable([in] PP_Instance instance,
                                    [in] str_t file_url,
                                    [out] uint64_t file_token_lo,
                                    [out] uint64_t file_token_hi);
 };